<template>
	<el-dialog :title="title" :visible.sync="open" width="800px" append-to-body @opened="modalOpened" @close="closeDialog()">
		<el-row>
			<el-col :xs="24" :md="24" :style="{ height: '350px' }">
				<vue-cropper
					v-if="visible"
					ref="cropper"
					:img="options.img"
					:info="true"
					:auto-crop="options.autoCrop"
					:auto-crop-width="options.autoCropWidth"
					:auto-crop-height="options.autoCropHeight"
					:fixed-box="options.fixedBox"
					@realTime="realTime"
				/>
			</el-col>
		</el-row>
		<el-row class="mt-[20px]">
			<el-col :lg="{ span: 1, offset: 2 }" :md="2">
				<el-button icon="el-icon-plus" size="small" @click="changeScale(1)"></el-button>
			</el-col>
			<el-col :lg="{ span: 1, offset: 1 }" :md="2">
				<el-button icon="el-icon-minus" size="small" @click="changeScale(-1)"></el-button>
			</el-col>
			<el-col :lg="{ span: 1, offset: 1 }" :md="2">
				<el-button icon="el-icon-refresh-left" size="small" @click="rotateLeft()"></el-button>
			</el-col>
			<el-col :lg="{ span: 1, offset: 1 }" :md="2">
				<el-button icon="el-icon-refresh-right" size="small" @click="rotateRight"></el-button>
			</el-col>
			<el-col :lg="{ span: 2, offset: 6 }" :md="2">
				<el-button type="primary" size="small" @click="uploadImg">保存</el-button>
			</el-col>
		</el-row>
	</el-dialog>
</template>

<script>
import { VueCropper } from 'vue-cropper';
export default {
	components: { VueCropper },
	data() {
		return {
			// 是否显示弹出层
			open: false,
			// 是否显示cropper
			visible: false,
			// 弹出层标题
			title: '裁剪',
			options: {
				img: null, //裁剪图片的地址
				autoCrop: true, // 是否默认生成截图框
				autoCropWidth: 760, // 默认生成截图框宽度
				autoCropHeight: 350, // 默认生成截图框高度
				fixedBox: false, // 固定截图框大小 不允许改变
			},
			previews: {},
			img: null,
		};
	},
	methods: {
		// 编辑头像
		editCropper(url) {
			this.open = true;
			this.img = url;
			this.setAvatarBase64(url, (base64) => {
				this.options.img = base64;
			});
		},
		setAvatarBase64(src, callback) {
			let _this = this;
			let image = new Image();
			// 处理缓存
			image.src = src + '?v=' + Math.random();
			// 支持跨域图片
			image.crossOrigin = '*';
			image.onload = function () {
				let base64 = _this.transBase64FromImage(image);
				callback && callback(base64);
			};
		},
		// 将网络图片转换成base64格式
		transBase64FromImage(image) {
			let canvas = document.createElement('canvas');
			canvas.width = image.width;
			canvas.height = image.height;
			let ctx = canvas.getContext('2d');
			ctx.drawImage(image, 0, 0, image.width, image.height);
			// 可选其他值 image/jpeg
			return canvas.toDataURL('image/png');
		},
		// 打开弹出层结束时的回调
		modalOpened() {
			this.visible = true;
		},
		// 覆盖默认的上传行为
		requestUpload() {},
		// 向左旋转
		rotateLeft() {
			this.$refs.cropper.rotateLeft();
		},
		// 向右旋转
		rotateRight() {
			this.$refs.cropper.rotateRight();
		},
		// 图片缩放
		changeScale(num) {
			num = num || 1;
			this.$refs.cropper.changeScale(num);
		},
		// 上传预处理
		beforeUpload(file) {
			if (file.type.indexOf('image/') === -1) {
				this.msgError('文件格式错误，请上传图片类型,如：JPG，PNG后缀的文件。');
			} else {
				const reader = new FileReader();
				reader.readAsDataURL(file);
				reader.onload = () => {
					this.options.img = reader.result;
				};
			}
		},
		// 上传图片
		uploadImg() {
			this.$refs.cropper.getCropBlob((data) => {
				let formData = new FormData();
				formData.append('file', data);
				this.$request.post('/common/upload', formData).then((res) => {
					this.$emit('image', res.data);
					this.open = false;
					this.options.img = null;
					this.img = null;
					this.msgSuccess('裁剪成功');
					this.visible = false;
				});
			});
		},
		// 实时预览
		realTime(data) {
			this.previews = data;
		},
		// 关闭窗口
		closeDialog() {
			if (this.img) {
				this.$emit('image', {
					url: this.img,
				});
			}
			this.open = false;
			this.visible = false;
		},
	},
};
</script>
<style scoped lang="scss">
.user-info-head {
	position: relative;
	display: inline-block;
	height: 120px;
}

.user-info-head:hover:after {
	content: '+';
	position: absolute;
	left: 0;
	right: 0;
	top: 0;
	bottom: 0;
	color: #eee;
	background: rgba(0, 0, 0, 0.5);
	font-size: 24px;
	font-style: normal;
	-webkit-font-smoothing: antialiased;
	-moz-osx-font-smoothing: grayscale;
	cursor: pointer;
	display: flex;
	align-items: center;
	justify-content: center;
	//line-height: 110px;
	border-radius: 50%;
}
</style>
